Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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 FMUL [reg,reg] │ fmul   st,st(2)        │  87 130-145 (90-105)*
                │ fmul   st(5),st        │ 287 130-145 (90-105)*
                │ fmul                   │ 387 to=46-54 (49),fr=29-57 (52)£
                │                        │ 486 16
────────────────┼────────────────────────┼──────────────────────────────────
 FMULP reg,ST   │ fmulp  st(6),st        │  87 134-148 (94-108)*
                │                        │ 287 134-148 (94-108)*
                │                        │ 387 29-57 (52)£
                │                        │ 486 16
────────────────┼────────────────────────┼──────────────────────────────────
 FMUL memreal   │ fmul   DWORD PTR [bx]  │  87 (s=110-125,l=154-168)+EA§
                │ fmul   shortreal[di+3] │ 287 s=110-125,l=154-168§
                │ fmul   longreal        │ 387 s=27-35,l=32-57
                │                        │ 486 s=11,l=14
────────────────┼────────────────────────┼──────────────────────────────────
 FIMUL memint   │ fimul  int16           │  87 (w=124-138,d=130-144)+EA
                │ fimul  warray[di]      │ 287 w=124-138,d=130-144
                │ fimul  double          │ 387 w=76-87,d=61-82
                │                        │ 486 w=23-27,d=22-24
────────────────┴────────────────────────┴──────────────────────────────────
  * The clocks in parentheses show times for short values──those with 40
    trailing zeros in their fraction because they were loaded from a
    short-real memory operand.
 
  £ The clocks in parentheses show typical speeds.
 
  § If the register operand is a short value──having 40 trailing zeros
    in its fraction because it was loaded from a short-real memory
    operand──then the timing is (112-126)+EA on the 8087 or 112-126 on
    the 80287.
                                    -♦-